Chasing-mill



4 Sheets-Sheet 1.., B. C. WHITE.

UHASING MILL.

(No Model.)

'Patented Deo. 26, 1893.

4 Sheets-Sheet 3.

A(No Model.) B GHAING MILL.

Patented Deo. 26, 1893.

- Imm/2m? mda 75m? )ff/Ziff:

.- z5' fa. MWmL y may (No Model.) 4 Sheets-Sheet; 4,

B. C. WHITE.

Y `GILIAHIG MILL'. No. 511,382. Patented Deo. 26, 1893.

/zzl fifa/viaggi nnnnnnnnnnnnn c.

UNITED STATES PATENT OFFICE.

BRUCE C. VHITE, CF CHICAGO, ILLINOIS.

\ CHASlNG-IVIILL.

SPECIFICATION forming part of Letters Patent No. 511,382, dated December 26, 1893.

Application filed March 2l, 1893. Serial No. 467.051. (No model.)

To all whom, t may concern:

Be it known that l, BRUCE C. VHITE, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Chasing-Mills; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this speciication.

This invention relates to improvements in that class of grinding or pulverizing machines known as chasing mills, which comprise arotating table upon which the material to be crushed is placed,and one or more heavy rollers resting upon the table and journaled in supports affording a free vertical movement of said rollers, while at the same time preventing them from moving with the table.

The machineillustrated in this instance is particularly intended for grinding or pulverizing the clay used in brick making, but the same general principles of construction may be employed in chasing mills used for otherpurposes.

The invention consists iu the parts, improvements and combinations hereinafter set forth and particularly described in the appended claims. p

Referring to the drawings: Figure l is a top plan View of a chasing mill constructed in accordance with my invention. Fig. 2isa sectional elevation taken on the line 2-2 of Fig. l. Fig. 3 isau end elevation of the machine. Fig. 4.- is a plan detail of the base plate. Fig. 5 is a detail section on line 5--5 of Fig. 3. Fig. 6 is a detail section taken on line 6 6 of Fig. 7. Fig. 7 is a detail section taken on line 7-7 of Fig. 6. Fig. 8 is a plan detail of the rotating table with the grating removed. Fig. 9 isa sectional elevation on line 9-9 of Fig. 8. Figs. 10 and ll are details ofaconstruction of plow point somewhatfl modified from that shown in Fig. 1.

In the drawings A designates the supporting frame work of the machine; B the rotating table, and C the crushing rolls resting upon said table. Said supporting frame work consists, in this instance, of two longitudinal sill timbers A A2, which are adapted to be bolted to a suitable foundation by means of foundation bolts ct. Upon the sill timbers A A2are supported transverse timbers ASA, which in this instance are notched into said sill timbers and are bolted thereto by suitable bolts a2. Said transverse timbers ASA4 are spaced apart a distance greater than the maximum diameter of the rotating table B, and the latter, which is of generally circular form, is revolubl)1 supported between them by being journaled at its center upon the free upper end of rigid upright shaft or spindle D. The spindle D is supported in the frame work of the machine at its lower end only, said lower' end being for this purpose cast in or otherwise rigidly secured to a transverse base plate or casting E, which extends between and rests upon the sill timbers AA2. Such base plate or casting, which is shown in detail in Fig. 4, consists of a flap web E adapted to be bolted to the sill timber by means of suitable bolts a3 and provided at its center with a depending hub Ezwithin which the spindle D is tightly secured. Parallel depending webs E3, engaging the inner sides of the sill timbers and boltedthereto by suitable bolts a4, serve to secure the base plate against lateral movement, while transverse ribs E4 extending from said parallel webs to the hub E2 serve to give the necessary rigidity and strength to the casting.

For the purpose of driving the rotating table B,the latter is provided on its under side witha circular rack bintermeshing with a beveled driving pinion F, which is keyed to a horizontal driving shaft G. Said driving shaft is in this instance supported by being journaled at its ends in suitable journal bearings G G2, the former of which is bolted to the adjacent surface of the base plate E, while the latter rests upon and is bolted t0 a cross-timber A5 (shown as mortised into the sill timbers A A2) by means of bolts a6. An aperture formed in the transverse timber A4 permits the passage of the driving shaft through said timber. Said shaft is in this instance shown as provided with a driving pulley H, by which the shaft may bedriven by means of suitable belting connecting with any source of power, and said shaft is also provided with a loose pulley H upon which the belt maybe thrown when it is desired to stop the machine.

Referring more in detail to the construc- IOO Y tion of the revolving table B, the same consists of a circular bottom B', surrounded by a cylindrical wall B2, extending a considerable distance above the bottom B and serv` ing toA retain thereon the material placed upon the table. Said bottom B is composed of a solid circular interior section B3 upon which the rollers C rest, and an annular rim B4, connected with the interior section by a plurality of arms or ribs B5. To said rim B4 the cylindrical wall B2 is secured. That portion of the surface of the interior section B3 which is traversed by the rollers C is preferably formed by a series of removable segmental plates B6, which are countersunkinto said interior section and are secured therein by suitable countersunk bolts b; thus providing an annular bearing surface which may be readily renewed when worn. The driving rack l), before referred to, is located on the interior section B2, said rack in this instance being cast integral therewith, directly bcneath the path of the rollers C. The driving power is thus applied directly at the point of greatest resistance. Upon the ribs B5 and upon the outer edge of the interior section B3 and the inner edge of the rim are secured perforated plates or gratings B7; thus providing a perforated annular section immediately adjacent to the cylindrical wall B2, through which the materials may sift after being pulverized. The ribs B5 instead of being radial are herein shown as being arranged obliquely to the radii of the table, this construction being employed for the purpose of reducing the liability of the table to break in casting because of the unequal contraction in the cooling of the parts thereof.

The middle portion of the revolving table B which serves as a journal bearing engaging the upper portion of the spindle D, consists of a cylindrical sleeve B8 extending both above and below the bottom B', and the closed upper end of which rests upon the top of the spindle D and supports the weight of the revolving table and parts carried thereby. Said Sleeve Bgis herein shown as made of a separate piece from the bottom B', and as rigidly secured within the same by being provided with a conical bearing surface b2, engaging a central aperture of similar shape in the bottom B, and with a circular iiange B2l at the lower edge of said bearing surface b2, upon which iiange the bottom of the table is adapted to rest; suitable bolts b3 extending through said flange B1 and bottom B' serving to rigidly clamp the parts together. The top portion B8 resting upon the upper end of the spindle D is herein shown as made in the form of a separable cap B10, adjustably secured to the sleeve by means of bolts b4, and provided centrally on its under side with a downward projecting cylindric boss B11 extending downwardly from the cap and bearing at its lower end against the upper end of the spindle D.

A series of wear plates d, of hardened steel or other suitable material is herein shown asinterposed between thelower surface of said boss B11 and the top surface of the spin dle to afford an easily renewable, anti-friction bearing between said surfaces. As herein shown the wear plates immediately adjacent to the boss B11 and the top of the spindle D are secured respectively to said lug and to the spindle by means of screws d d'; thereby relieving the surface of said lug and spindle from any wear. To provide for lubrication of the bearing, the top of the spindle is provided with a recess D into which the boss B11 extends, and in which the wear plates are located, said recess being adapted to contain a considerable quantity of" oil, in which the bearing surfaces are immersed.

For the purpose of providing for vertical adjustment of the table to counteract the set tling which will inevitably take place as the wear plates grow thin from continued use, and which, if not provided for, will cause the rack b to bind against the driving pinion F, an annular bearing plate B12 is herein shown as interposed between the sleeve BS and cap B10, said annular bearing plate being made with its interior diameter equal to or larger than the interior diameter of the sleeve B2, and being clamped centrally between said sleeve and cap by means of the bolts b1. When it is desired to raise the table to compensate for the wear of the plates d, said annular bearing plate B12 may be removed from the machine and turned o on its face or otherwise reduced in thickness so as to accurately bring the table to the desired position. Upon the replacing of said bearing plate, after being so turned off, and upon clamping the cap B10 firmly down upon said plate, it is obvious that the sleeve B2, and with it the rotating table, will have been lifted toa degree depending on the reduction in thickness of the said bearing plate. Lubricant is introduced to the beari-ng thus formed, through suitable ducts B13 in the cap B10 and will fill that part of the recess D not occupied by the boss B11 and wear plates d and thereby keep the said wearing surfaces immersed in said lubricant; whilethe surplus""lubricant will overliow the recess D and run down between the interior of the sleeve B8 and the spindle D for lubrieating these parts; the bearing plate B12 serving as a dam to prevent any of the lubricant from escaping between the cap and sleeve.

As hereinbefore stated, the crushing roll, ers C are journaled in supports which aiford a free vertical movement of said rollers, while at the same time preventing their moving with the table B. rlo this end said rollers are provided with journals formed by laterally extending ends of transverse shafts C which are rigidly keyed within the rollers, the journals thus formed being engaged by suitable journal boxes provided in the outer ends of the radial arms I, I, the inner ends of which are pivotally supported upon a bearing shaft J. Such pivotal engagement is in this in- IIO ' able so that it may be easily replaced whenstance formed by providing each pair of arms I I with an integral sleeve I which is journaled upon said shaft J. Adjustable collars I2 placed at each end of said sleeve I prevent lateral movement of the arms I and consequently of the rollers journaled therein. The bearing shaftJ is supported at its ends in suitable boxes J', which in this instance rest upon and are bolted to the transverse timbers A3 A4, the boxes being herein shown as held in place by the bolts a2 a2 which secure the transverse timbers to the longitudinal sill timber A2.

Any suitable method of attaching the roller C to its shaft may of course be used, but in this instance and as a separate improvement I have provided an attaching device in the form of a transverse bolt c engaging a suitable aperture near the center of the roll, and a transverse slot in the circumference of the shaft. Provision is made for inserting said bolt by forming in the face of the roll adjacent to one end of the bolt aperture, an elongated recess C2 of a length greater than the length of the bolt c, and, near the other end of the bolt engaging aperture, a recess c3 sufiiciently large to receivethe retaining nuts c by which said bolt c is secured in place. Ob- Viously by this construction the bolt c may be inserted in its aperture by being first slipped into the recess C2 and then driven longitudinally into its seat; the retaining nut c being located in the said recess C2 and being engaged with the bolt when the latter is inserted.

For the purpose of continuously deflecting or throwing inwardly the material placed on the revolving table into position to be acted upon by the crushing rolls C, the machine is herein shown as provided with oblique deectors or plows K, placed diametrically opposite each other and supported within the cylindrical wall B2 by means of suitable arms K bolted to the stationary frame work of the machine, in this instance to the transverse timbers A3 A4, by means of bolts a5. Each of said plows is arranged with its lower edge near the surface of the table and with its outer margin near the cylindric rim B2; the plow being placed at such an angle as to defleet the material lying upon the perforated annular surface of the table inwardly upon the interior section B3 into the path of the crushing rolls C. The body of the plow or deflector is shown as consisting of a metal plate K2 which is bolted by bolts k to the supporting arm K', the plate being thus remov worn out by long use.

As a further and separate improvement each plow is shown Vas provided at the angle formed by its outer and lower edges, with a removable plate K3 secured to the body of the plow by means of bolts la la. It will be obvious that the greatest wear on the plow will occur at the point of the same which extends' into the corner formed by the cylindrical wall B2 and the bottom B of the table, and to provide for this I have provided the removable plate K3; said plate being reversible so that two ormore of its corners may be placed 1ny position to take the wear. In the particular construction shown, the bolts k la pass through apertures in .the plate K3 and elongated slots in the plate K2. The heads of said 'bolts k are countersunk into the face'of the wear Vplates K3 so as to stand fiush with the surface thereof and the bolt holes in said plate are located at equal distances from each side and end thereof so that the bolts will tit the holes when the plate is turned end for end with either side edge uppermost or with either face in contact with the plow. Said bolt holes are furthermore, countersunk upon both sides of the plate to receive the heads of the bolts when either face of lthe plate may be exposed. By this constructlon it is obvious that every corner of the wear plate may be in turn placed at the point of greatest wear, 't'. e., at the corner formed by the cylindric wall and the bottom of the table, and thus may be used in its various positions a long time before it becomes entirely worn out.

The operation of the machine thus described is substantially the same as that of other machines of this class. The machine being set in motion, the materials to be pulverized are thrown upon the table and by the operation of the plows H will be directed beneath or into the path of the crushing rolls C C. The pulverized material will gradually work out over the screens B7 and fall through the same beneath the machine. Such portions of the material as are not reduced in size sufficiently to pass through the perforations in the screen B7 will be again deflected by the plows into the path of the rollers C and again subjected to their action, and bya continuation of this process all of the materials will eventually be pulverized sufficiently to pass through the screens.

I claim as my invention- 1. A chasing mill comprising a supporting frame work, a rigid spindle secured to said frame work at its lower end only, a rotative table and a crushing roller adapted to rest on said table, said table being provided with a central sleeve engaging the upper end of saidupright spindle and carrying the weight of 'the table and parts supported thereby, substantially as described.

2. A chasing mill comprising a supporting frame work, a rigid spindle secured :in said frame work at its lower end only, a rotative table and a crushing roller adapted to rest thereon, said table being provided with acentral sleeve adapted to engage the upper end of said rigid spindle, said sleeve being provided at its upper end with a removable cap adapted to rest upon the upper end of said spindle, and carrying the weight of the rotary table and parts supported thereby, substantially as described.

3. A chasingmill comprising a supporting IOC IIO

frame work, an upwardly projecting rigid spindle attached to said f rame work at its lower end only, a rotative table and a crushing roller adapted to rest on said table, said table being provided with a central sleeve engag ing the upper portion of said spindle, a removable cap adjustably secured to the upper end of said sleeve and adapted to rest on the upper endof said rigid spindle to support the weight of the table and parts carried thereby, substantially as described.

4. A chasing mill provided with an upwardly extending rigid spindle, and a rotative table provided with a central sleeve engaging the free upper end of the spindle, and provided with an adjustable cap, and an annular bearing plate interposed between the upper end of the sleeve and the cap, substantially as described.

5. A chasing mill provided with an upwardly projecting rigid spindle, and a rotative table provided with a central sleeve engaging the upper end of the spindle, said sleeve being provided with an adjusting cap having a downwardly extending boss engaging the upper end of the spindle, substantially as described.

6. A chasing mill provided with an upwardly projecting rigid spindle and a rotative table provided with a central sleeve engaging the free upper end of said spindle, a cylindric recess in the top of the spindle, a removable cap on said sleeve,provided on its underside with a downwardly projecting boss extending into said recess whereby the engaging surfaces of the bearing thus formed may be constantly immersed in lubricant contained in said recess, substantially as described.

7. A chasing mill provided with an upwardly projecting rigid spindle and a rotative table having a central sleeve rotatively engaging the free upper end of said rigid spindle, a removable cap secured to the upper end of said sleeve, and anti-friction wear-plates interposed between the under side of said cap and the upper end of the sleeve, substantially as described.

S. A chasing mill provided with an upwardly projecting rigid spindle and arotative table having a central sleeve rotatively engaging the free upper end of said rigid spindie, a removable cap secured to the upper end of said sleeve, and anti-friction wear-plates interposed between the under side of said cap and the upper end of the sleeve, the wear plates immediately adjacent to the under surface of the cap and the upper surface of the spindle being attached respectively to said cap and spindle, substantially as described.

9. A chasing mill provided with an upwardly projecting rigid spindle, arotative table having a central sleeve engaging the upper end of said spindle, an adjustable cap secured to the upper end of said sleeve, provided on its under side with a downwardly projecting boss, a cylindric recess in the upper end of the spindle adapted to receive said boss, and antifriction wear plates interposed between the bottom ot said recess and the lower end of said boss, whereby the bearing surfaces of the thrust bearing thus formed may be constantly immersed in the lubricant supplied in said recess, substantially as described.

lO. A chasing mill provided with an up wardly projecting rigid spindle and a rotary table having a central sleeve engaging said spindle, a removable cap adjustably secured to the upper end of said sleeve, an annular bearing plate adapted to be clamped between said cap and sleeve, the interior diameter of said annular plate being not less than the interior diameter of said sleeve, a downwardly projecting boss on the underside of said cap, a recess in the upper end oi' said spindle adapted to receive said lug, and a duct for supplying suitable lubricant within said recess, substantially as described.

ll. A chasing mill comprising an upright rigid spindle, a rotative table consisting ot' a metal casting provided with a central aperture, and a sleeve engaging the upper end of the spindle, said sleeve being inserted through the aperture in the table and being provided with a lateral projection or flange on which the table is supported, substantially as described.

12. A rotary table for chasing mills comprising a solid inner portion, an annular rim, and a plurality of ribs connecting said annular rim with said inner portion, said ribs being oblique to the radii of the table, substantially as described.

13. A detlecting plow for chasing mills provided with a reversible rectangular wear plate, provided at each end with an aperture located equidistant from the sides and end of said plate, said apertures being countersu nk on both sides, and securing bolts having countersunk heads for securing said Wear plate to the face of the p1ow,whereby said wear plate may be turned to bring eitherotl its four corners into operative position, substantially as described.

In testimony that I claim the foregoing as my invention I affix my signature in presence of two witnesses.

BRUCE C. WHITE. Witnesses:

C. CLARENCE POOLE, HENRY W. CARTER. j,

IOO 

